Xinjiang is a Chinese region where at least 8 million Uighurs live and are subjected to incredibly intrusive surveillance. Uighurs refer to the region as East Turkestan.

The footage of Yingye'er Transformation Through Education Camp, which was taken in August, shows rows of rooms along a long corridor, with jail cell-like iron doors in front of each of them.

Some are used as dorm rooms, with up to 15 people living inside, and others are used as classrooms, Bitter Winter said.

China imprisons up to 1 million Uighurs in detention centers and re-education camps in Xinjiang, activists say. Beijing has consistently denied that accusation, referring to the camps instead as "free vocational training" that make life "colorful."

Inside one of the rooms in Yingye'er camp, according to Bitter Winter's footage. It's not clear whether this room was designed to be a dormitory or a classroom.Bitter Winter/YouTube

According to the magazine, every room in the building has two sets of iron doors. It says the outermost one also has a guard railing and a keypad lock. Such a system would mean that the people inside the rooms can be locked in, and only authorities are allowed to get them out.

The windows at the camp also appear to be tightly secured, with iron bars outside the windows.

Bitter Winter wrote: "There is no difference between its inner constructions and those of a prison."

Numerous patriotic, pro-China posters can be seen on the corridor's walls outside classrooms.

Slogans include: "Be grateful" and "Follow the guidance of Xi Jinping's thought on socialism with Chinese characteristics for a new era, and untiringly strive to realize the Chinese dream of a great rejuvenation of the Chinese nation."

Every room and corner of the building is outfitted with a surveillance camera. Footage showed what appeared to be a control room with multiple screens that cover the whole building.

Screenshot of Bitter Winter's video showing a slogan adorning the wall of the Yingye'er camp, which says: "Be grateful."Bitter Winter/YouTube

Shawn Zhang, a Vancouver-based researcher, estimated that the entire facility could hold between 27,000 to 35,000 people.

Bitter Winter said the camp was still under construction when Bitter Winter collected the footage in August. One month later, an employee of the camp told the magazine that several thousand individuals were already being kept there, but declined to say who they were.

This would fit in with reports from elsewhere in Xinjiang, of so many Uighurs being detained that authorities were running low on places to keep them.

In October, Radio Free Asia reported that Xinjiang authorities were secretly transferring Uighur detainees to prisons around the Chinese mainland because existing re-education camps were too crowded to house them all.

Watch Bitter Winter's video here:

Bitter Winter's footage of Yingye'er camp matches the descriptions of former detainees and witnesses of other detention facilities in Xinjiang.

Mihrigul Tursun, a former detainee, told reporters on Monday that she was interrogated for four days in a row without sleep, and electrocuted.

She told a Washington, DC press conference, according to the Associated Press: "White foam came out of my mouth, and I began to lose consciousness ... The last word I heard them saying is that you being an Uighur is a crime."